Transformer core



Sept.v 1930. w. 5;. SCHWENZER 1,775,053

TRANSFORMER coam Filed Feb. 10, 1930 W'ZZZZIZEJJm wvwr INVENTCR ATTORNEYPatented Sept. 2 1930 UNITED STATES WILLIAM E. SCHWENZEB, OF ERIE,PENNSYLVANIA TRANSFORMER CORE Application filed February 10, 1930.Serial No. 427,326.

This invention relates to a transformer core, the general object of theinvention being to make the core of compact form and allowing the coilsto he placed close to the cores and making the transformer of lightweight with low core loss.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to

be hereinafter fully described, illustrated in the accompanying drawingand specifically pointed out in the appended claims.

In describing the invention in detail, reference will he had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout'the several Views, and in which Figure 1is an elevation of a core for a twophase transformer.

Figure 2 is a plan view of Figure 1, showing parts in dotted lines, withparts omitted.

Figure 3 is a view of one of the clamping devices.

Figure 4 is a view of one of the post forming plates.

Figure 5 is a view of one of the plates used at the top and bottom of athree-phase device.

Figure 6 is a plan view of an arrangement for a cruciform transformer.

Figure 7 is a view of one of the clamping devices for a cruciformtransformer.

Figure 8 is a view of one of the post forming plates for the cruciformdevice.

Figure 9 is a view of a disk used in the arrangement shown in Figure 6.

Figure 10 is a plan view of an arrangement used in a large cruciformdevice.

Referring to Figures 1, 2, 3 and 4, the numerals 1 indicate the platesused for forming the top and bottom portions of the frame of a two-phasetransformer, as shown at A in Figure 1. Each plate is formed withcircular end portions and a straight intermediate portion, the circularparts having the annular row of small holes 2 therein.

The posts B are each formed of a plurality of circular plates 3, eachformed with a central opening 4: and an annular row of holes 5 5, theseholes registering with the holes in f the top and bottom plates so thatbolts 6 can pass through some of the holes to hold the plates 1 and 3 inposition, the remainin small holes forming oil passages. The plates 3are also formed with notches 7 in their edges for receiving the woodenstrips 8, as shown in Figure 1. The plates 1 of each of the top andbottom sets are clamped together at the centers by the strips 9 and thebolts 10.

Clamping members 11, each formed with the arms 12, are connected withthe top and bottom parts of the device by the bolts 6 and support theinsulators 13, as shown in Figure 1.

Thus I have provided a transformer frame composed of a plurality ofplates placed one upon the other and connected together by the bolts,with oil passages passing through the parts and the openings 4 in theplates 3 form hollow cores for the posts of the device.

Figure 5 shows a plate 1 used for forming the top and bottom portions ofa three-phase frame, this plate having a central circular enlargement 14in addition to the circular enlargements at the ends and all theenlargements are provided with the annular rows of holes, as beforedescribed.

Figure 6 shows plates 16 for forming the top and bottom portions of acruciform frame, each plate being formed with a central circularenlargement and a small enlargement at the outer end of each arm, thecentral enlargements also having the annular row of holes, as beforedescribed.

The small enlargements each have a small hole'17 at their center forreceiving the bolts which alsopass through the disks 18 which form theouter cores, disks 19 forming the inner core or post, these disks beingplaced t between the central enlargements of the top and bottomportions. The coil is placed on this central post and theinsulators forthe coil are supported by the projections carried by the top and bottomplates 20, one of which is shown-in Figure 7.

Figure 10 shows a cruciform composed of thetop and bottom parts formedof the plates 21 which have enlargements at their centers and at theends of their arms, all of these tions together, each top andbottomplate havmg circular portions inalignment with the.

enlargements having the annular row of holes therein and the posts ofthis transformer are formed of plates similar to that shown in Figure 8.A low voltage coil is placed on the central post and high voltage coilson the outer posts, the insulators of all the posts being supported bythe upper and lower plates 20 which are made similar to theplates shownin Figure 7. The plates forming the posts may be provided with thecentral openings, as shown in Figure 8, so as to make, the posts ofhollow construction or these holes can be omitted, if desired.

Thus I have provideda transformer frame composed of a plurality ofplates placed one upon another so that the core loss is reduced to aminimum and the arrangement of the parts permits the coils to beplacedclose to the cores.

It is thought from the foregoing description that the advantages'andnovel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claims. 7

That I claim is i 1. A transformer frame consisting of top and bottomportions formed of elongated plates placed one upon the other and postportions formed of plates placed one upon the other and means forconnecting'the portions together.

2. A transformer frame consisting of top and bottom portions formed ofelongated plat-es placed one upon the other and post portions formed ofcircular plates placed one upon the other, meansfor connecting theportions together, each top and bottom plate having circular portions inalignment with the post portionsand the said circular plates'hav- .ingcentral openings therein.

3. A transformer frame consisting of top and bottom port1ons formed ofelongated plates placed one upon the other and post portions formed ofcircular plates placed one upon the other, means for connecting theportions together, each top and'bottom plate having circular portions inalignment with the post portions and the said circular plates havingcentral openings therein and the circular portions and the circularplates having annular rows of holes, some of the holes WlLLIAM E.SCHWENZER.

forming oil passages and the others receiving bolts which form theconnecting means.

4:- A'transf-ormer frame consisting of top and bottom portions formed ofelongated plates placed one upon the other andlpost portions formed ofcircular plates placed one uponthe other, means for connecting theporp-ost :portionsiand the said circular portions and circular plateshaving annular rows of

